C Program to illustrate the use of rand() function

#include <stdio.h>
#include <stdlib.h>
#include <time.h>


int main ()
{
  /* initialize random generator */
  srand ( time(NULL) );


  /* generate random numbers */


  printf ("A number between 0 and 100: %d\n", rand() % 100);


  printf ("A number between 20 and 30: %d\n", rand() % 10 + 20);


  return 0;
}